Prepping a D3S for sale, what to do?

Now that I have my D4 in hand and have shot over 5200 photos with it, I am ready to sell off my D3S. I was thinking of sending the D3S into Nikon USA service and have them do a full cleaning and adjustment, but was wondering if it is worth the cost.

Will having a receipt from Nikon service showing recent cleaning and adjustment even recoup the cost of that in the resale market?
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Clifford W Martin
aka BigRedDogATL
http://cwmartin.smugmug.com